4kcsq center differential won't unlock!

This may help:
http://www.endosquid.com/audi/aud4kfix_diff1.htm
At 03:42 PM 7/6/01 -0500, Richard J. Andrews wrote:
>there is a rod running along the pass side of the transmission,
>you can either push or pull on the rod and this will lock/unlock the
>center diffs,
>>HTH!
>rich
>'86 4kq
>>At 12:46 PM 7/6/01 -0700, you wrote:
>>>>I've got an '86 4kcsq with over 200k on the clock. I've given it to my
>>folks, who recently started complaining about its performance. Turns out
>>the center diffy is permanently locked (differential lock indicator light
>>is on), and it won't turn off with the switch. Obviously, this hurts tight
>>cornering performance somewhat :-) I think they've been driving it like
>>this for a while -- hopefully this hasn't trashed the front drive!
>>comments?
>>>>Anyway, I've gotta get it unlocked. I've been under it for a little while
>>searching for vacuum lines, as I assume one of them is leaking or has
>>detached or something. Man, it's tight down there. I think the vacuum
>>servo is between the battery box and the cat. Don't want to start taking
>>things apart until I know for sure. Is the interior lock console switch
>>electronic or vacuum? Could this be a simple relay or wiring problem?
>>>>Help!!!
>>>>--Pete
>>>>P.S. please e-mail me at this account (pfhamilton@ucdavis.edu)
>